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Bisymmetric matrices are both symmetric centrosymmetric and symmetric persymmetric.; The product of two bisymmetric matrices is a centrosymmetric matrix. Real-valued bisymmetric matrices are precisely those symmetric matrices whose eigenvalues remain the same aside from possible sign changes following pre- or post-multiplication by the exchange matrix.
The Masked Singer Vietnam (Vietnamese: Ca sĩ mặt nạ) is a Vietnam reality singing competition that premiered on HTV2 - Vie Channel, Vie Giải Trí and the VieON app from July 16, 2022. This is the Vietnamese version of the South Korean television show King of Mask Singer , and is part of the Masked Singer franchise.
Nguyễn Khoa Tóc Tiên (Vietnamese: [tɐwk͡p̚˧ˀ˦ tiɜŋ˧]; born 13 May 1989), [1] known simply as Tóc Tiên, is a Vietnamese singer.. Beginning her career as a child, Tiên later became a teen idol, participating in several singing competitions and releasing two studio albums: Nụ cười nắng mai (2007) and Tóc Tiên thiếu nữ (2008).